In a mixing bowl, combine the flour, yeast, salt, olives, herbs, water, and olive oil.
Knead the dough until it is elastic and supple, about 5 minutes using a stand mixer fitted with a dough hook or 10 minutes by hand. Add more flour or water as necessary.
Place the dough in a clean oiled bowl. Cover and leave to rest in a warm space until the dough has doubled in size, about 2 hours.
Line a large baking sheet with parchment paper.
Lightly flour your work surface with a mixture of 1 tablespoon of semolina and 1 tablespoon of bread flour. Tip the dough out and shape it into a ½ inch thick rectangle of about 13 x 8 inches.
Transfer the dough to the baking sheet.
Using a bench scraper or pizza cutter, cut the fougasse in the middle leaving a 1-inch border at the top and bottom. Cut 4 diagonal slots on each side, leaving a 1-inch border on each side.
Stretch the dough carefully to make each cut slightly bigger. For the design of the fougasse to show, each leaf should have about 1-inch gap.
Cover with a cloth and leave to proof in a warm place for 30 minutes.
Preheat the oven to 425 F.
Brush the fougasse with olive oil.
Bake in the oven until golden, about 20 to 25 minutes.